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I don't think the New Franklin can be compared to the Old Franklin . I believe the new one is built in Poland
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It is still the same engine
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but there was zero factory support
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There is still no factory support and the few shops that used to service Franklins are very scarce.
You are very much on your own even more so than screwing around with a Subaru but it is experimental aviation and anyone willing to try something new
has a lot of company among Rvators.
You'll have to build your own engine mount and exhaust system,
no small feat even for an experienced gear head.
Weight is hard to pinpoint.
My RV-8 with IO 360 and fixed pitch Sensenich weighed the same as
the Franklin Powered RV-8.
Much effort was spent to keep the weight of the Franklin powered RV down.
Build time stretched out 2 more years after I completed my Lyc powered RV-8.
There is no mechanical fuel pump available for the Franklin, you are stuck with
electric pumps. (no big deal)
You are limited to a McCauley Propeller or maybe an IVO Prop.
(Scariest Prop I ever tried)
On a side by side trip to Oshkosh from California we compared efficiency and
my IO 360 lost by about 10% on fuel economy. (Not a good comparison fixed pitch against constant speed)
If you bring the mogas equation into the picture I would be ahead by dollars.
Taking resale value into account for those who care about it, you decide.
If you want 6 cylinder smoothness, go for the IO 540 and you'll spend less
time making it work than re engineering the front end of an RV for a 220 hp Franklin.
Hang a light weight MT prop on it and you are down to a few pounds of weight shifting to get your CG in the right place.
You'll be able to fly anywhere and get service and parts on a moments notice.